Cooter 1978.

Methods	Design: randomised controlled trial Randomisation: individual Trial: daily vitamins including iron versus daily vitamins without iron Date of study: not stated
Participants	Setting: university at Georgetown University (USA) Malaria endemicity: not stated Included: female varsity basketball players aged 18 years to 24 years (mean age not reported) Excluded: not stated Dropouts: not stated Sample size: total: 10; intervention: 5, control: 5
Interventions	Intervention: vitamin including iron (18 mg) as ferrous fumarate daily Control: vitamin without iron daily Duration: 4 months
Outcomes	Haemoglobin, iron indices
Notes	Compliance: not stated Conflicts of interest: not stated Funded by: not stated
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not reported
Allocation concealment (selection bias)	Unclear risk	Not reported
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Placebo administered
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Not reported. Biochemical indices unlikely to be influenced by assessors' knowledge of allocation
Incomplete outcome data (attrition bias) All outcomes	Low risk	No apparent attrition
Selective reporting (reporting bias)	Low risk	Not evident
Other bias	Low risk	Not evident